summaryrefslogtreecommitdiffstats
path: root/src/file_icns.c
blob: ddc4dbe92025bfa84b8f76a81cb293ce3a1dc51b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
/*

    File: file_icns.c

    Copyright (C) 2015 Christophe GRENIER <grenier@cgsecurity.org>

    This software is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write the Free Software Foundation, Inc., 51
    Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 */

#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_icns)
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#include "types.h"
#include "filegen.h"
#include "common.h"

/*@ requires \valid(file_stat); */
static void register_header_check_icns(file_stat_t *file_stat);

const file_hint_t file_hint_icns= {
  .extension="icns",
  .description="Apple Icon Image",
  .max_filesize=PHOTOREC_MAX_FILE_SIZE,
  .recover=1,
  .enable_by_default=1,
  .register_header_check=&register_header_check_icns
};

struct icns_header
{
  uint32_t magic;
  uint32_t size;
};

struct icon_data
{
  char type[4];
  uint32_t size;
//  uint8_t  data[0];
};

/*@
  @ requires \valid_read(type + (0 .. 3));
  @ assigns  \nothing;
  @*/
static int check_icon_type(const char *type)
{
  /* https://en.wikipedia.org/wiki/Apple_Icon_Image_format */
  if(memcmp(type, "ICON", 4)==0 ||
      memcmp(type, "ICN#", 4)==0 ||
      memcmp(type, "icm#", 4)==0 ||
      memcmp(type, "icm4", 4)==0 ||
      memcmp(type, "icm8", 4)==0 ||
      memcmp(type, "ics#", 4)==0 ||
      memcmp(type, "ics4", 4)==0 ||
      memcmp(type, "ics8", 4)==0 ||
      memcmp(type, "is32", 4)==0 ||
      memcmp(type, "s8mk", 4)==0 ||
      memcmp(type, "icl4", 4)==0 ||
      memcmp(type, "icl8", 4)==0 ||
      memcmp(type, "il32", 4)==0 ||
      memcmp(type, "l8mk", 4)==0 ||
      memcmp(type, "ich#", 4)==0 ||
      memcmp(type, "ich4", 4)==0 ||
      memcmp(type, "ich8", 4)==0 ||
      memcmp(type, "ih32", 4)==0 ||
      memcmp(type, "h8mk", 4)==0 ||
      memcmp(type, "it32", 4)==0 ||
      memcmp(type, "t8mk", 4)==0 ||
      memcmp(type, "icp4", 4)==0 ||
      memcmp(type, "icp5", 4)==0 ||
      memcmp(type, "icp6", 4)==0 ||
      memcmp(type, "ic07", 4)==0 ||
      memcmp(type, "ic08", 4)==0 ||
      memcmp(type, "ic09", 4)==0 ||
      memcmp(type, "ic10", 4)==0 ||
      memcmp(type, "ic11", 4)==0 ||
      memcmp(type, "ic12", 4)==0 ||
      memcmp(type, "ic13", 4)==0 ||
      memcmp(type, "ic14", 4)==0 ||
      memcmp(type, "TOC ", 4)==0 ||
      memcmp(type, "icnV", 4)==0)
      return 1;
  return 0;
}

/*@
  @ requires buffer_size >= sizeof(struct icns_header) + sizeof(struct icon_data);
  @ requires \valid_read(buffer+(0..buffer_size-1));
  @ requires valid_file_recovery(file_recovery);
  @ requires \valid(file_recovery_new);
  @ requires file_recovery_new->blocksize > 0;
  @ requires separation: \separated(&file_hint_icns, buffer+(..), file_recovery, file_recovery_new);
  @ ensures \result == 0 || \result == 1;
  @ ensures  \result!=0 ==> valid_file_recovery(file_recovery_new);
  @ assigns  *file_recovery_new;
  @*/
static int header_check_icns(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new)
{
  const struct icns_header *hdr=(const struct icns_header *)buffer;
  const struct icon_data *icon=(const struct icon_data *)&buffer[8];
  const unsigned int hdr_size=be32(hdr->size);
  const unsigned int icon_size=be32(icon->size);
  if(hdr_size < sizeof(struct icns_header))
    return 0;
  if(icon_size < sizeof(struct icon_data))
    return 0;
  if(icon_size > hdr_size - 8)
    return 0;
  if(!check_icon_type(icon->type))
    return 0;
  reset_file_recovery(file_recovery_new);
  file_recovery_new->extension=file_hint_icns.extension;
  file_recovery_new->calculated_file_size=hdr_size;
  file_recovery_new->data_check=&data_check_size;
  file_recovery_new->file_check=&file_check_size;
  return 1;
}

static void register_header_check_icns(file_stat_t *file_stat)
{
  register_header_check(0, "icns", 4, &header_check_icns, file_stat);
}
#endif